Spectral analysis of paleomagnetic directions can be accomplished easily by first mapping the data onto the complex plane and then using a reliable spectral estimator such as Burg's maximum entropy method for complex time series. Paleomagnetic measurments on the Narita bed by Nagata et al. serve to illustrate the procedure. Spectra of paleosecular variation are helpful for resolving historical tendencies toward clockwise and counterclockwise field motions associated with nondipole longitudinal drift.